3-way USB 2.0 HUB There are 4 buttons with customizable functions. The factory default is the previous song, pause playing, song, and mute. 1 knob for adjusting volume or brightness. Note: Because there is no external power supply, it is only suitable for plugging in receivers and the like. Besides, game players not think about it, and there be additional delays. The software can only be used by system. After setting, the system can also be used directly. Please use 10 and above systems Colour:Black Material:acrylic fiber Size:110mmx54mmx27mm Package Contents: 1 * USB Hub Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.